Label Microoperations CD BR AD ORG O ADD: NOP READ I CALL INDRCT NEXT JMP JMP U ADD U FETCH ORG 4 BRANCH: NOP S JMP OVER NOP U JMP FETCH OVER: NOP ARTPC I CALL INDRCT JMP FETCH ORG 8 STORE: NOP I CALL INDRCT АCTDR WRITE U JMP NEXT U JMP FETCH ORG 12 EXCHANGE: NOP READ I CALL INDRCT U JMP NEXT ACTDR, DRTAC WRITE NEXT FETCH U JMP JMP ORG 64 FETCH: РСТAR JMP NEXT READ, INCPC DRTAR JMP NEXT МАР JMP INDRCT: READ U NEXT DRTAR RET
Label Microoperations CD BR AD ORG O ADD: NOP READ I CALL INDRCT NEXT JMP JMP U ADD U FETCH ORG 4 BRANCH: NOP S JMP OVER NOP U JMP FETCH OVER: NOP ARTPC I CALL INDRCT JMP FETCH ORG 8 STORE: NOP I CALL INDRCT АCTDR WRITE U JMP NEXT U JMP FETCH ORG 12 EXCHANGE: NOP READ I CALL INDRCT U JMP NEXT ACTDR, DRTAC WRITE NEXT FETCH U JMP JMP ORG 64 FETCH: РСТAR JMP NEXT READ, INCPC DRTAR JMP NEXT МАР JMP INDRCT: READ U NEXT DRTAR RET
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
Related questions
Question
|
AR |
0003 |
|
DR |
004F |
|
AR |
025 |
|
PC |
102 |
Transcribed Image Text:TABLE 7-2 Symbolic Microprogram (Partial)
Label
Microoperations
CD
BR
AD
ORG O
ADD:
NOP
I
CALL
INDRCT
READ
JMP
NEXT
ADD
U
JMP
FETCH
ORG 4
BRANCH:
NOP
S
JMP
OVER
NOP
NOP
FETCH
INDRCT
U
JMP
OVER:
I
CALL
ARTPC
U
JMP
FETCH
ORG 8
NOP
АCTDR
STORE:
I
CALL
INDRCT
U
JMP
NEXT
WRITE
JMP
FETCH
ORG 12
NOP
READ
EXCHANGE:
I
CALL
INDRCT
JMP
NEXT
ACTDR, DRTAC
WRITE
JMP
NEXT
U
JMP
FETCH
ORG 64
FETCH:
РСТAR
JMP
JMP
NEXT
READ, INCPC
NEXT
DRTAR
U
МАР
JMP
RET
INDRCT:
READ
U
NEXT
DRTAR
U
![TABLE 7-1 Symbols and Binary Code for Microinstruction Fields
F1
Microoperation
Symbol
00
None
NOP
ADD
CLRAC
001
AC-AC + DR
010
AC+0
11
AC+AC + 1
INCAC
100
AC+DR
AR -DR(0–10)
DRTAC
101
DRTAR
110
AR -PC
PCTAR
111
M[AR]-DR
WRITE
F2
Microoperation
Symbol
000
None
NOP
001
AC+AC - DR
SUB
AC+AC V DR
AC+AC A DR
DRM[AR]
DR +AC
010
OR
AND
READ
АCTDR
011
100
101
110
DR +DR + 1
INCDR
111
DR(0-10) – PC
РCTDR
F3
Microoperation
Symbol
000
None
NOP
AC+ACO DR
AC+AC
001
XOR
010
COM
11
AC+shl AC
SHL
100
AC+shr AC
SHR
! 101
110
111
РC- РC + 1
INCPC
PC+AR
ARTPC
Reserved
CD
Condition
Symbol
Comments
00
Always = 1
DR(15)
AC(15)
U
Unconditional branch
01
I
Indirect address bit
Sign bit of AC
Zero value in AC
10
11
AC = 0
BR
Symbol
Function
00
JMP
CAR +AD if condition = 1
CAR +CAR + 1 if condition = 0
CAR +AD, SBR +CAR + 1 if condition = 1
CAR +CAR + 1 if condition = 0
CAR +SBR (Return from subroutine)
CAR(2-5) -DR(11-14), CAR(0,1,6) –0
01
CALL
10
RET
11
МАР](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc353cc0f-0c4d-4d5b-a3e6-e746dbb90f94%2F67abfa84-de87-4577-9bfa-606f496aff91%2F01iw0sc_processed.png&w=3840&q=75)
Transcribed Image Text:TABLE 7-1 Symbols and Binary Code for Microinstruction Fields
F1
Microoperation
Symbol
00
None
NOP
ADD
CLRAC
001
AC-AC + DR
010
AC+0
11
AC+AC + 1
INCAC
100
AC+DR
AR -DR(0–10)
DRTAC
101
DRTAR
110
AR -PC
PCTAR
111
M[AR]-DR
WRITE
F2
Microoperation
Symbol
000
None
NOP
001
AC+AC - DR
SUB
AC+AC V DR
AC+AC A DR
DRM[AR]
DR +AC
010
OR
AND
READ
АCTDR
011
100
101
110
DR +DR + 1
INCDR
111
DR(0-10) – PC
РCTDR
F3
Microoperation
Symbol
000
None
NOP
AC+ACO DR
AC+AC
001
XOR
010
COM
11
AC+shl AC
SHL
100
AC+shr AC
SHR
! 101
110
111
РC- РC + 1
INCPC
PC+AR
ARTPC
Reserved
CD
Condition
Symbol
Comments
00
Always = 1
DR(15)
AC(15)
U
Unconditional branch
01
I
Indirect address bit
Sign bit of AC
Zero value in AC
10
11
AC = 0
BR
Symbol
Function
00
JMP
CAR +AD if condition = 1
CAR +CAR + 1 if condition = 0
CAR +AD, SBR +CAR + 1 if condition = 1
CAR +CAR + 1 if condition = 0
CAR +SBR (Return from subroutine)
CAR(2-5) -DR(11-14), CAR(0,1,6) –0
01
CALL
10
RET
11
МАР
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